DATA Bill problems

I raised the complaint below on the10th of November 2015 and up to now no one called me to resolve it. I took a contract for 2gig and a router worth R129 per month in September. The problem I have is that when I took the contract in September I clearly stated that I do not want anything above the contracted 2 gig and the limit was set at -1 for the duration of the first month. My October bill came out as R1200 and the call centre agent said that what I should do is to pay the amount because I used the data (this is contestable) and categorically stated that the limit at times works at times it doesn't work. This was not explained to me when I took the contract. I am not new to Vodacom and I have been using another line for data and the limit works perfectly fine for the last 3 years. My issue is with the R1200 bill, why should I pay it despite stating that I don't want any extra charges above the monthly R129 and that the limit set did not work is not my problem because it was never explained to me in the first place. the call centre agent cant even help me she was actually insisting that I pay R22 for the itemised bill which is day light ***. can someone at Vodacom assist me